Browsing is a valuable way to learn about birds, however it is a brute force approach and not designed for identification.
A more sophisticated approach to finding a bird with specific field marks is to use the Step by Step Search.
You can also try the Wizard to find a bird, which uses a question and answer approach, but again it does not give you the flexibility of the Step by Step Search.

Lewis's Woodpecker: Medium woodpecker with dark green-black upperparts and hood. Face is dark red, collar is gray, belly is pale red. The bill, legs and feet are black. It was named for Meriwether Lewis of the Lewis and Clark expedition. Its dark plumage sets it apart from all other North American woodpeckers.

Least Tern: This small tern has slate-gray upperparts, white underparts; crown and nape are black, and the forehead is white. Black leading edge of outer wing is conspicuous in flight. The tail is forked, and the bill and feet are yellow. It feeds on small fish and invertebrates. It has a fast smooth flight with rapid wing beats. Hovers briefly before dipping down to seize prey. Sexes are similar.